UP-2 is an analog positioner available in pneumatic and electro-pneumatic versions. The positioner has a heavy duty design making it suitable for use in very harsh conditions. It is used as the control part of the pneumatic valve set in oil and gas, refining, chemical, power, metal production and other fields with automated systems. The UP-2 pneumatic version accepts a 3-15 psi (0.2-1 bar) signal and the electro-pneumatic version a 4-20 mA signal. The positioner is based on the balanced-forces principle with air distribution to the actuator chambers carried out by an internal spool. UP-2 is designed to be used on linear actuators (with a minimum stroke of 8 mm) or on rotary actuators which use different feedback systems such as the lever or motion converter MC model.

The positioner is a double acting positioner but it can also be used as single acting. It is equipped with a different linear cam (angle up to 270°) to allow use on actuators with different strokes. The cam operating angles and range adjustments are printed on the positioner. Special cam profiles are available on request.

The UP-2 NC 1/4” is available with a bypass valve between the actuator chamber connections. This is built into the change-over system so the actuator action can be changed without having to rebuild the piping. The positioner is available in different models:

  • UP2/L for lever applications;
  • UP-2/R for rotary applications.

There are different sizes (ND 1/4” or ND 1/2”) and the positioner can come with or without an integrated air-lock device (the AL model), with a lever or bare shaft, standard or Namur.


  • Action inversion without tubing inversion only for ND 1/4” version
  • Available with a full stainless steel spool valve for ND 1/4”
  • Heavy duty design
  • High reliability
  • Integrated bypass only for ND 1/4” version
  • Split range signal
  • Special characterisation/range
  • Suitable for large size/fast stroking actuator
  • Full stainless steel spool valve for ND 1/2”
  • Visual position indicator
  • Suitable for:
    Standard, offshore, sandstorm, copper free ambient conditions
    Single and double acting actuators
    Low and high ambient temperature

Technical data

Input Signal

3-15 psi

4-20 mA

Standard operating temperature

-20°C to 70°C

(lower or higher temperature on request)

CV max low flow

ND 1/4” Inlet = 0.34

ND 1/4” Outlet = 0.34

ND 1/2” Inlet = 0.637

ND 1/2” Outlet = 0.79

Air consumption

ND 1/4” 1.02 Nm3/h (0.6 SCFM) at 400 kPa

ND 1/2” 1.30 Nm3/h (0.8 SCFM) at 400 kPa

+0.09 Nm3/h (0.06 SCFM) for version with I/P


Feeding connection

ND 1/4” 

ND 1/2”

Electrical connection

 ND 1/2” NPTF


Supply pressure

2.5÷7 bar


0.5% of full stroke


1% of the full range


0.15% of full range

Accessories available

Air-Lock ND 1/4” integrated

Change-over plate with by-pass valve

Intrinsically safe and explosion-proof electro-pneumatic version for ATEX execution

Pressure gauges

VDI/VDE 3845 EN 15714-3 connections (NAMUR)

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